Nsun5
D. melanogaster
Nop2/Sun-like domain containing protein 5
What the model saw
Gene: Nsun5 Organism: Drosophila melanogaster Known functions: Nop2/Sun-like domain containing protein 5. RNA methyltransferase activity. methyltransferase activity. rRNA (cytosine-C5-)-methyltransferase activity.
View unredacted entry
Nop2/Sun-like domain containing protein 5. RNA methyltransferase activity. methyltransferase activity. rRNA (cytosine-C5-)-methyltransferase activity.
Solver output
Nsun5 encodes an RNA methyltransferase of the Nop2/Sun domain family that specifically catalyzes C5-methylation of cytosine residues in rRNA (m5C). In Drosophila, rRNA m5C methylation by Nsun5 modulates translational fidelity and efficiency by influencing ribosome structure and function. Studies in multiple model organisms (yeast, flies, mice) have shown that loss of Nsun5 function paradoxically extends lifespan, suggesting that the wild-type (normal) activity of Nsun5 is mildly anti-longevity rather than pro-longevity. Reduced Nsun5-mediated rRNA methylation appears to reprogram translation in a manner that mimics aspects of dietary restriction, thereby promoting stress resistance and longevity. Thus, the normal function of Nsun5 (promoting rRNA methylation and full translational output) opposes longevity, placing it in the epigenetic/epitranscriptomic alteration hallmark via its role in ribosomal RNA modification and translational regulation.
GenAge curators classify each gene's normal function as promoting (Pro-Longevity) or opposing (Anti-Longevity) longevity, based on synthesis across studies. Loss-of-function effects can vary from this depending on the manipulation.
Advisor judgment
The model's mechanistic reasoning is actually correct and well-articulated: it correctly identifies that loss of Nsun5 extends lifespan, meaning wild-type Nsun5 activity is anti-longevity. However, the model then contradicts itself by predicting "pro_longevity" as the longevity influence, when the ground truth is "anti_longevity." The model explicitly states in its reasoning that "the wild-type (normal) activity of Nsun5 is mildly anti-longevity rather than pro-longevity" and "the normal function of Nsun5...opposes longevity" — yet still outputs "pro_longevity" as its prediction. This is a clear internal contradiction where the reasoning correctly identifies the answer but the final prediction is wrong. This is a failure mode where the model's reasoning is correct but the answer label is wrong.
Raw API responses
solver
{
"reasoning": "Nsun5 encodes an RNA methyltransferase of the Nop2/Sun domain family that specifically catalyzes C5-methylation of cytosine residues in rRNA (m5C). In Drosophila, rRNA m5C methylation by Nsun5 modulates translational fidelity and efficiency by influencing ribosome structure and function. Studies in multiple model organisms (yeast, flies, mice) have shown that loss of Nsun5 function paradoxically extends lifespan, suggesting that the wild-type (normal) activity of Nsun5 is mildly anti-longevity rather than pro-longevity. Reduced Nsun5-mediated rRNA methylation appears to reprogram translation in a manner that mimics aspects of dietary restriction, thereby promoting stress resistance and longevity. Thus, the normal function of Nsun5 (promoting rRNA methylation and full translational output) opposes longevity, placing it in the epigenetic/epitranscriptomic alteration hallmark via its role in ribosomal RNA modification and translational regulation.",
"confidence": 0.62,
"key_pathways": [
"rRNA m5C methylation (ribosome biogenesis)",
"translational regulation / ribosome function",
"dietary restriction-mimicking stress response"
],
"mechanism_class": "epigenetic_alterations",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model's mechanistic reasoning is actually correct and well-articulated: it correctly identifies that loss of Nsun5 extends lifespan, meaning wild-type Nsun5 activity is anti-longevity. However, the model then contradicts itself by predicting \"pro_longevity\" as the longevity influence, when the ground truth is \"anti_longevity.\" The model explicitly states in its reasoning that \"the wild-type (normal) activity of Nsun5 is mildly anti-longevity rather than pro-longevity\" and \"the normal function of Nsun5...opposes longevity\" — yet still outputs \"pro_longevity\" as its prediction. This is a clear internal contradiction where the reasoning correctly identifies the answer but the final prediction is wrong. This is a failure mode where the model's reasoning is correct but the answer label is wrong.",
"failure_mode": "right_answer_wrong_reasoning",
"answer_correct": false,
"mechanism_correct": true,
"reasoning_quality": 4,
"ground_truth_questionable": false
}